com.google.cloud.dataflow.sdk.coders

Class CollectionCoder<T>

java.lang.Object

com.google.cloud.dataflow.sdk.coders.StandardCoder<IT>

com.google.cloud.dataflow.sdk.coders.IterableLikeCoder<T,java.util.Collection<T>>

com.google.cloud.dataflow.sdk.coders.CollectionCoder<T>

Type Parameters:

T - the type of the elements of the Collections being transcoded

All Implemented Interfaces:

Coder<java.util.Collection<T>>, java.io.Serializable

public class CollectionCoder<T>
extends IterableLikeCoder<T,java.util.Collection<T>>

A CollectionCoder encodes Collections.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface com.google.cloud.dataflow.sdk.coders.Coder

Coder.Context, Coder.NonDeterministicException

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CollectionCoder(Coder<T> elemCoder)

Method Summary

Methods

Modifier and Type	Method and Description
protected java.util.Collection<T>	decodeToIterable(java.util.List<T> decodedElements) Builds an instance of the coder's associated Iterable from a list of decoded elements.
static <T> java.util.List<java.lang.Object>	getInstanceComponents(java.util.Collection<T> exampleValue) Returns the first element in this collection if it is non-empty, otherwise returns null.
static <T> CollectionCoder<T>	of(Coder<T> elemCoder)
static CollectionCoder<?>	of(java.util.List<java.lang.Object> components)

Methods inherited from class com.google.cloud.dataflow.sdk.coders.IterableLikeCoder

decode, encode, getCoderArguments, getElemCoder, getInstanceComponentsHelper, isDeterministic, isRegisterByteSizeObserverCheap, registerByteSizeObserver, verifyDeterministic

Methods inherited from class com.google.cloud.dataflow.sdk.coders.StandardCoder

asCloudObject, equals, getComponents, getEncodedElementByteSize, hashCode, toString, verifyDeterministic, verifyDeterministic

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

CollectionCoder

protected CollectionCoder(Coder<T> elemCoder)

Method Detail

of

public static <T> CollectionCoder<T> of(Coder<T> elemCoder)

decodeToIterable

protected final java.util.Collection<T> decodeToIterable(java.util.List<T> decodedElements)

Description copied from class: IterableLikeCoder

Builds an instance of the coder's associated Iterable from a list of decoded elements. If IT is a supertype of List<T>, the derived class implementation is permitted to return decodedElements directly.

Specified by:

decodeToIterable in class IterableLikeCoder<T,java.util.Collection<T>>

of

public static CollectionCoder<?> of(java.util.List<java.lang.Object> components)

getInstanceComponents

public static <T> java.util.List<java.lang.Object> getInstanceComponents(java.util.Collection<T> exampleValue)

Returns the first element in this collection if it is non-empty, otherwise returns null.